Browsing by Author "Umaz, Adil"

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Investigation of Changes Against Time in the Artificial Gastric Liquid Medium of Pesticide Active Substances
(2021) Aydın, Fırat; Umaz, Adil; Elmastaş, Ayhan
In this study, grown tomato samples were examined changes of pesticide active substances by two different methods in the artificial gastric liquid (AGL) medium prepared. In the first method, Trifloxystrobin and Imidacloprid pesticide active substances were sprayed on the tomato samples before the harvest period. Time-dependent change of the active substance of Trifloxystrobin; although initially 83.17 ng g-1, it was determined as 24.71 ng g-1 in 240 min. The concentration of this active substance was determined that decreased with time and the % change was 70.29. While Imidacloprid active substance initially was 10.20 ng g-1, it was determined as 10.32 ng g-1 at 240 min. It was determined that this active substance did not change between the first and the last concentration depending on the time. In the second method, 75 pesticide active substances were spiked to the tomato sample and the time-dependent change in the AGL medium was examined. The concentration of 10 active substances that above 70% of the change rate was determined that there was a statistical decrease depending on the time % changes in the range between 0-240 min. The concentration of 30 active substances in below 70% of the change rate was determined that did not a statistical decrease as depending on time. however, % changes were observed that there was a certain thought at different rates between the first and the last concentration after 240 min. The last 15 active substances 240 min concentrations were determined that increased of % changes compared to 0 min.
Citation - WoS: 2
Citation - Scopus: 3
Determination and comparison of metal contents in simulated body fluid medium conditions of the plant species by flame atomic absorption spectrometry (FAAS)
(Journal of Research in Pharmacy, 2022) Umaz, Adil; Firat, Aydin; Tokul Olmez, Ozge; Firat, Mehmet; Ertas, Abdulselame; Aydin, Isil
ABSTRACT: The importance of plants in folk medicine and scientific studies is increasing day by day. In this context, the plants pose a danger to human health when they are eaten by the public, consumed as herbal tea or used as medicinal plants especially the toxic metals in their composition. For this reason, determining the macro, micro and toxic element content in the plants is important for health. In this study; the metal contents of root and aerial parts of nine different Salvia species were determined and the chemometric evaluation of the obtained results was made. In the principal component analysis (PCA) made with 20 elements of Salvia species, it was determined that the first two principal components explained 62.60% of the variance and the first six principal components explained 92.70%. When PCA and hierarchical cluster analysis (HCA) results are evaluated; the parts of Salvia species root and aerial parts were determined that were not clearly separated and there was no regional grouping. In addition, Salvia species prepared as herbal tea was left to different simulated body fluid medium conditions, and the changes in metal contents were examined. It was determined that were taken up Cr, Cd, Pb, Cu, Zn metals in the simulated saliva fluid (SSF), Ni, Mn metals in the simulated gastric fluid (SGF), and Na, K metals in the simulated intestinal fluid (SIF). It was determined that Fe metal in almost all Salvia species was not taken from three simulated body fluid mediums. Thus, elements determined which were taken up in body fluid mediums.
Citation - WoS: 3
Citation - Scopus: 3
Determination of hydroxymethylfurfural in Turkish honeys, pekmez (grape molasses), and jam samples by high-performance liquid chromatography with diode array detection
(Wiley Online Library, 2022) Elmastas, Ayhan; Aydin, Firat; Umaz, Adil; Kılınc, Ersin; Arslan, Yasin; aydin, Isil
Hydroxymethylfurfural (HMF) is a chemical contaminant that is not naturally present in carbohydrate-containing food samples. The HMF amounts were changed between 4.8 and 214.1 mg/kg in honey; between 7.8 and 204.0 mg/kg in pekmez (grape molasses); between 5.9 and 22.4 mg/kg in strawberry jam; between 6.0 and 65.4 mg/kg in apricot jam; and between 9.2 and 55.9 mg/kg in cherry found by HPLC. The linear calibration plot of HMF was ranged from 0.05 to 10.0 mu g/ml. The correlation coefficient was found to be 0.99997. LOD and LOQ values were found to be 12.0 and 40.0 ng/ml, respectively. According to the experimental results, HMF amounts of four honey samples, three pekmez (grape molasses) samples, one apricot jam, and one cherry jam for investigated samples were found to be higher than the permission amount of Turkish Food Codex. Novelty impact statement Based on experimental results in this study, if the honey is in a transparent package such as a glass, it should be stored in a dark environment. It would be healthier to prefer molasses produced by reliable brands at low temperatures under vacuum instead of molasses made with traditional methods in open boilers. Generally, since jams with high HMF amount have an overcooked or even burnt flavor, this is an extremely negative situation for consumers.
Citation - Scopus: 3
Fe3O4@SA MNCs Synthesis, Characterization, and First-time Use in Hydrogen Production by NaBH4 Hydrolysis
(Turkish Chemical Society, 2024) Umaz, Adil
Hydrogen is a clean energy carrier that will reduce dependence on fossil fuels and contribute to reducing the harmful effects on the environment resulting from using fossil fuels. Hydrogen is produced by the hydrolysis of sodium borohydride (NaBH4), one of the chemical hydrides, using a catalyst. In this study, Fe3O4@Salicylic acid magnetic nano-catalyst (Fe3O4@SA MNCs) was synthesized using the co-precipitation technique. The structural, physical, and chemical properties of the produced Fe3O4@SA MNCs were characterized by FT-IR, XRD, VSM, SEM, and SEM-EDX methods. At room temperature, the effect on hydrogen production performance was examined in the amounts of Fe3O4@SA MNCs (10, 25, 50, 75, and 100 mg), NaOH (0, 10, 20, and 25 mg), and NaBH4 (25, 50, 100, 150 and 200 mg). The highest hydrogen generation rates (HGR) were obtained using 10 mg Fe3O4@SA MNCs, 150 mg NaBH4, and 0 mg NaOH at room temperature. The obtained HGR value was calculated as 400 mL gcat-1.min-1. Fe3O4@SA MNCs were used for hydrogen production for the first time in this study. This study showed that Fe3O4@SA MNCs exhibit catalytic properties and are a promising, efficient catalyst in hydrogen production from NaBH4.
İki Farklı Lokasyona ait Altın Otunun (Helichrysum arenarium) Uçucu Bileşenlerinin Belirlenmesi ve Karşılaştırılması
(Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2020) Umaz, Adil; Umaz, Kader
Bu çalışmada, 2019 yılı Haziran-Ağustos ayında iki farklı bölgede toplanan Altın Otunun (Helichrysum arenarium) Katı Faz Mikro Ekstraksiyon (SPME) yöntemi kullanılarak uçucu bileşenleri Gaz Kromatografisi-Kütle Spektroskopisi (GC-MS) ile belirlendi. Bitlis Nemrut Krater Gölü çevresindeki Altın Otu örneğinde toplam 21 adet uçucu bileşen tespit edilirken, Giresun’un Şebinkarahisar İlçesi’nin dağlık bölgelerindeki Altın Otu örneğinde toplam 33 adet uçucu bileşen tespit edildi. Bitlis Nemrut Krater Gölü çevresindeki Altın Otunda α-sedren (%26.65), α-pinen (%14.97), α-humulen (%10.65), aromadendren (%6.79), α-kurkumen (%6.31), germakren B (%4.43), α-kadinen (%3.82), ökaliptol (%3.57), α-duprezianen (%3.57) ve limonen (%2.69) uçucu ana bileşen olarak tespit edilirken, Giresun Şebinkarahisar İlçesinin dağlık alanlarındaki Altın Otuna ait örnekte α-pinen (%47.63), α-himakhalen (%17.01), α-humulen (%5.21), δ-kadinen (%4.98), γ-kadinen (%4.01) ve ökaliptol (%3.46) uçucu ana bileşen olarak tespit edildi.
Determination and comparison of metal analysis in the species belonging to different families by inductively coupled plasma-mass spectrometry (ICP-MS)
(International Journal of Chemistry and Technology (IJCT), 2022) Umaz, Adil; Aydın, Fırat; Fırat, Mehmet; Ertaş, Abdulselam
The consumption of plants and their use for medicinal purposes are increasing day by day. Therefore, knowing the plant contents is important for human health. In this study, metal contents of nineteen species belonging to four different families were determined. Different species belonging to the same genus belonging to these families and metal contents of different parts of the same sample were compared with each other. The metal contents of different species of the same genus have been determined that be different from each other. The metal contents of different parts of the same species were determined that be different from each other. In addition, the Cd and Pb metal content results of the species were compared with the maximum allowable concentration values in raw plant material of the World Health Organization's (WHO). Cd metal content in all species was found to be higher than the value determined by the WHO. Only the Pb metal content of the A3 species was found to be higher than the value determined by WHO.
Hypericum Triquetrifolium Turra Bitkisinden Gümüş Nanopartiküllerin Sentezi, Karekterizasyonu ve Antimikrobial Etkinliğinin İncelenmesi
(2019) Atalar, Mehmet Nuri; Baran, Mehmet Fırat; Umaz, Adil; Koç, Adil; Keskin, Cumali
Bu çalışmada, biyolojik yöntemle Hypericum triquetrifolium Turra bitkisi kullanılarak gümüşnanopartiküller (AgNP) sentezlendi. Sentezlenen gümüş nanopartiküller (AgNP) Fourier Transformİnfrared Spektroskopisi (FT-IR), Ultraviyole/Görünür Işık Absorpsiyon Spektrofotometresi (UV-vis),X-Işını Kırınımı (XRD), Taramalı Elektron Mikroskobu (SEM), Enerji Dağılımlı X-ışını (EDAX) veTermogravimetrik-Difarensiyel Termal Analiz (TGA-DTA) gibi spektroskopik yöntemler kullanılarakaydınlatıldı. Sentezlenen gümüş nanopartiküllerin mikroorganizmalar üzerindeki antimikrobiyalaktiviteleri incelenmiştir.
Synthesis, Characterization of a Novel Nickel-Organo Supported Magnetic Nanocatalysts (Fe3O4@SiO2@Tris@Ni): Effective Hydrogen Generation From Sodium Borohydride
(Elsevier Science SA, 2025) Umaz, Adil; Ece, Mehmet Sakir
Energy demand and environmental problems are increasing day by day as global threats. The burning of fossil fuels has harmful effects on ecological systems. Global threats related to energy can be eliminated by environmentally friendly, cost-effective, and renewable resources. Hydrogen is among the sustainable and renewable energy sources due to being the most common element on earth, non-toxic reaction products and having high calorific value. It was the first time nickel-organo-silica supported magnetic nanocatalysts (MNCs) were synthesised in this study. These synthesized MNCs were characterized in detail. Then, these MNCs were used to produce hydrogen from sodium borohydride in high efficiency. The saturation magnetization value and average particle size of the Fe3O4@SiO2@Tris@Ni MNCs have been measured as 33.27 emu/g and 10.26 nm, respectively. The Fe3O4@SiO2@Tris@Ni MNCs were used for the first time in hydrogen generation in this study. The hydrogen generation by sodium borohydride (NaBH4) methanolysis/ethylene glycolysis of the catalyst has been carried out at 298 K using 0.75 % NaBH4, 75 mg nanocatalyst, and 20 mL methanol/ethylene glycol. The amount of hydrogen produced in the methanol/ethylene glycol processes has been measured as 2167 mL H2/g NaBH4. The highest hydrogen generation rate has been obtained using 0.75 % NaBH4, 75 mg catalyst, and 20 mL ethylene glycol, and this value was calculated as 1067 mL H2/(min & sdot;gcat). The reusability performance of the catalyst was determined to have a decrease of 25.86 % after the fifth cycle compared to the initial use. According to these results, the catalyst is a promising material with advantages such as high efficiency in hydrogen generation and the possibility of repeated use.
An Investigation and Comparison of Concentration Change in Simulated Body Fluid Medium Conditions of the Calcium Element in 27 Different Salvia Species
(Istanbul Univ, Fac Pharmacy, 2023) Umaz, Adil; Aydin, Firat; Firat, Mehmet; Yener, Ismail; Ertas, Abdulselam; Elmastas, Ayhan
Background and Aims: In this study, calcium (Ca) element concentration changes of Salvia species in simulated body fluid (SBF) medium conditions were investigated and the results in these medium conditions were compared with each other.Methods: Salvia species samples were air-dried and ground into powder. Salvia species was prepared as a herbal tea. Pre-pared teas were left in three different SBF medium conditions. The samples were analyzed using Flame Atomic Absorption Spectroscopy (FAAS) method to determine the Ca absorptions. Also, a correlation analysis of the results obtained in three different SBF medium conditions and the species in simulated gastric fluid (SGF) medium conditions was performed.Results: When the SBF medium conditions were compared, it was determined that the highest Ca absorption of all Salvia species occurred in the SGF conditions. Thus, it can be said that the Ca in plants and foods occurs in the gastric fluid medium and its absorption occurs there. When the result of the correlation analysis was evaluated, it was determined that there was a stronger correlation between the SGF and simulated intestinal fluid (SIF) mediums compared to other mediums.Conclusion: The Ca absorption was determined according to what remained in the SGF the most. Based on the results ob-tained from SBF medium conditions, it can be said which element is taken in which body fluid medium. Information on the differences between samples belonging to different SBF medium conditions was not obtained. However, when the simulated fluid medium conditions were evaluated individually, information was obtained for two or more samples.
Citation - Scopus: 4
Determination of Multi-Elemental Analysis and Antioxidant Activities of Helichrysum arenarium (L.) Moench Species
(Hacettepe University, 2023) Umaz, Adil; Umaz, Kader; Aydın, Fırat; Aydın, Işıl
In this study, multi-elemental analysis and antioxidant activity of samples belonging to two different populations of Helichrysum arenarium (L.) Moench known as the immortal flower was determined. The results obtained were compared among themselves. Ca, Mg, Al, Fe, Na, Li, Be, B, Ti, Cr, Ni, Zn, Mo, and Pb element contents of the sample belonging to the B population were determined that be higher than that of the other population. The K, V, Mn, Co, Cu, As, Se, Sn, and Ba element contents of the sample belonging to the G population were determined that be higher than that of the other population. When the antioxidant activity results of the species were evaluated; according to the CUPRAC (Cupric Reducing Antioxidant Capacity) method, the sample extracts of the B and G populations were determined that showed lower activity than the standard BHA, BHT, and Trolox values at 20 and 40 µg/mL concentrations, and showed close activity compared to the standards at 80 µg/mL concentrations. The species was determined that be antioxidant activity even at low concentrations. According to DPPH (2,2-diphenyl-1-picrylhydrazyl) method, the antioxidant activity of the extract of the B and G populations was determined as 22.95 and 23.76 mg TE/mL, respectively.
Gümüş nanomalzeme sentezi ve antimikrobiyal uygulamaları
(2019) Baran, Mehmet Fırat; Saydut, Abdurrahman; Umaz, Adil
Çevre dostu sentez yöntemlerinin her geçen gün daha etkin olması ve nanopartiküllerin (NP’lerin) kullanım alanlarının yaygınlığı bu yöntemlere olan ilginin oldukça artmasına neden olmaktadır. Biz atık durumunda ki zeytin yapraklarından elde ettiğimiz özüt ile gümüş nano partikülleri (AgNP’leri) basit, ucuz ve çevre dostu bir yöntemle sentezledik. Bu partiküllerin Ultraviyole ve Görünür Işık Absorpsiyon Spektroskopi (UVVis.), Fourıer Dönüşümlü Kızılötesi Spektroskopisi (FTIR), X-Işınları Kırınım Cihazı (XRD), Taramalı Elektron Mikroskobu- Enerji Yayılımlı X-ışını (SEM-EDX) ve Termo Gravimetrik (TGA-DTA) analizleri kullanılarak karakterizasyon işlemi yapılmıştır. Antibiyotik dirençliliği günümüz dünyasının ciddi sorunlarından biri bu sebeple elde edilen partiküllerin patojen gram pozitif Staphylococcus aureus ATCC 29213, gram negatif Escherichia coli ATCC 25922 suşları ve Candida albicans mayası üzerinde etkili bir anti-mikrobiyal aktivite gösterdiği tespit edilmiştir. AgNP’lerin MİK (Minimum İnhibisyon Konsantarasyon) değerleri sırası 0.112, 0.028, ve 0.007 olarak bulunmuştur
Citation - WoS: 2
Citation - Scopus: 5
Evaluation as time-dependent of pesticides applied in pre-harvest period of grown vegetables: removal of pesticide residues in the vegetables
(Taylor & Francis Online, 2022) Elmastas, Ayhan; Umaz, Adil; Pirinc, Vedat; Aydin, Firat
Pesticide use has benefits such as increasing the quality and amount of food required to sustain the human population. However, its harmful effects on the environment and human health are of great concern. The aim of this study was to evaluate concentrations as timedependent of the pesticide and the removal of pesticide residues in vegetable samples with the aid of the QuEChERS 2007.01 procedure. The analytical method has been validated according to SANTE/12682/2019. Good linearity (2.5–100 ng/mL, R2 > 0.99) was observed, and the recovery yields ranged from 94.76% to 104.03%, repeatability (RSDr) ranged from 2.33% to 4.59% and reproducibility (RSDwR) ranged from 4.06% to 8.40%. LOD and LOQ values were determined to be 3.00 ng/g and 10.00 ng/g, respectively. The grown tomato, eggplant and cucumber samples were sprayed with drugs against pests and diseases. Imidacloprid in the grown tomato, cucumber and eggplant samples was determined to be 0.026, 0.186 and 0.096 mg/kg, respectively. Trifloxystrobin was determined to be 0.102, 0.129 and 0.063 mg/kg, respectively. It was determined that pesticide residue in vegetable samples decreases by washing and peeling but does not disappear completely. The peeling process was determined to be more effective than washing. The concentration of pesticide residues in the shell part was found to be hight than in the whole product. Thus, it is important to consume vegetables with their skin peeled and to consume the unpeeled ones by washing them with water at least.
Determination of Trace Manganese Contents in Real Samples and Interference Studies by Combining Coated Magnetic Nanoparticle-Assisted Solid-Phase Microextraction With Slotted Quartz Tube-Flame Atomic Absorption Spectrometry
(Springer Wien, 2025) Aydin, Firat; Umaz, Adil; Umaz, Kader; Aydin, Isil
This study aimed to propose a sensitive analytical method to determine trace levels of manganese by combining magnetic nanoparticle (MNP)-assisted solid-phase microextraction (SPME) with slotted quartz tube flame atomic absorption spectrometry (SQT-FAAS). MNP was used as an absorbent in the extraction processes, univariately optimizing parameters such as pH, buffer volume, MNP amount, eluent concentration and volume, mixing type and duration, and interaction time to improve extraction efficiency. The limits of detection and quantification values for the developed MNP-SPME-SQT-FAAS method were identified as 108 and 359 mu g/dm(3), respectively. The coefficient of determination, percentage relative standard deviation, and percentage recovery values were also calculated as 0.9995, 3.84, and 96.73, respectively. As a result, the developed MNP-SPME-SQT-FAAS method improved the detection power of the traditional FAAS method by 16.91-fold. This method is the first to accurately and sensitively determine trace manganese content in nut samples. The developed MNP-SPME-SQT-FAAS method was confirmed that have a high sensitivity to determine the trace amounts of manganese and displayed potential applicability for real samples.
Citation - Scopus: 2
Design, Synthesis, Characterization, and Surface Texture Investigation of a Novel Nickel-Supported Magnetic Nanocatalyst (Hierarchical Layered) for Efficient Hydrogen Production (Hydrolysis/Alcoholysis)
(Elsevier, 2025) Umaz, Adil; Ece, Mehmet Sakir
In this study, Fe3O4@TROMETHAMINE-Ni magnetic nanocatalysts (MNCs) were synthesized for the first time. Various characterization techniques, including fourier transform infrared spectroscopy (FTIR), x-ray diffractometer (XRD), scanning electron microscopy (SEM), pulsed sample magnetometer, electron paramagnetic resonance (EPR), and surface area measurement (BET), have been used to elucidate the structure and morphology of Fe3O4@TROMETHAMINE-Ni MNCs. The average particle size, surface area, and saturation magnetization value of Fe3O4@TROMETHAMINE-Ni MNCs have been measured as 7.97 nm, 60.11 m2/g, and 43.49 emu/g, respectively. The Fe3O4@TROMETHAMINE-Ni MNCs were determined to be superparamagnetic. EPR analysis was used to calculate the g-factor values before and after sodium borohydride (NaBH4) hydrolysis of Fe3O4@TROMETHAMINE-Ni MNCs, which were found to be 4.81 and 4.95, respectively. This value indicates that the electrons surrounding the oxygen vacancies formed on the catalyst surface can enhance transport efficiency and improve catalytic activity. It was optimized by many parameters in hydrogen production with hydrolysis/alcoholysis of NaBH4 using Fe3O4@TROMETHAMINE-Ni MNCs. For hydrogen production by NaBH4 hydrolysis of Fe3O4@TROMETHAMINE-Ni MNCs, it has been carried out using 265 mM NaBH4, 75 mg Fe3O4@TROMETHAMINE-Ni MNCs, and 20 mL of pure water/methanol at room temperature. The amount of hydrogen produced under optimum conditions has been measured as 1533 mL/min & sdot;gcat. It was determined that the reusability performance of Fe3O4@TROMETHAMINE-Ni MNCs showed a minor decrease of 8.42 % compared to the initial usage after the sixth cycle. These results show that Fe3O4@TROMETHAMINE-Ni MNCs are a promising material with advantages such as high efficiency in hydrogen production and the ability to be used repeatedly.
Citation - WoS: 1
Citation - Scopus: 2
Synthesis and Characterization of Fe3O4/MethylCellulose@Pb as a Heterogeneous Fenton-Like Catalyst for Photodegradation of Different Dyes
(Elsevier, 2025) Umaz, Adil; Ece, Mehmet Sakir
With the development of industry, serious pollution has emerged in water resources. This poses serious problems for the health of living things and the environment. To deliver a sustainable future, producing effective, low-cost, and reusable photocatalysts in wastewater treatment is important. In this study, Fe3O4/MetCel@Pb photo-catalysts were synthesized for the first time. The properties of Fe3O4/MetCel@Pb photocatalysts were characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Brunauer-Emmett-Teller (BET), Ultraviolet-Visible Spectrophotometry (UV-Vis), Vibrating Sample Magnetometry (VSM), Electron Spin Resonance (ESR), Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM), and X-ray Photoelectron Spectroscopy (XPS). The average particle size, surface area, band gap energy, saturation magnetization, resonance magnetic field, and g-factor values of the Fe3O4/MetCel@Pb photocatalysts measured as 63.88 nm, 40.59 m2 g-1, 5.71 eV, 24.80 emu g-1, 390.15 mT, and 1.731, respectively. XPS analysis showed signals confirming strong C-O bonds, Fe-O bonds, Fe2+, and Fe3+ at binding energies of 286.04, 528.00, 711.39, and 723.84 eV, respectively. Also, Fe3O4/MetCel@Pb photocatalysts were used for the first time in the dye degradation. The degradation of methylene blue (MB), methyl orange (MO), phenol red (PR), alizarin yellow (AY), and bromthymol blue (BTB) dyes under ultraviolet-visible light for 30 min was determined as 100 %, 96.76 %, 94.51 %, 80.81 %, and 71.93 %, respectively. In the reusability study, Fe3O4/MetCel@Pb photo-catalysts showed a reduction rate of 1.70 % compared to the first cycle even after the fourth cycle. The stability and repeated reusability of Fe3O4/MetCel@Pb photocatalysts without deformation were realized. Application of Fe3O4/MetCel@Pb photocatalysts in real dyed water samples (even in mixed matrix samples) showed over 90 % dye degradation efficiency. This confirms that the photocatalyst is an effective catalyst in dye degradation. Fe3O4/MetCel@Pb photocatalysts, which are economical, easy to prepare, and stable, will be an effective option for the removal of industrial waste paints (cationic and anionic dye) from aqueous systems. In addition, using these photocatalysts will provide ease of process, as well as time and cost savings.
Citation - WoS: 5
Citation - Scopus: 5
Determination of Zinc in Dried Nuts by Slotted Quartz Tube-Flame Atomic Absorption Spectrometry (SQT-FAAS) With Citric Acid-Coated Magnetic Nanoparticle (CAMNP) Based Solid Phase Extraction (SPE)
(Taylor & Francis Inc, 2025) Umaz, Kader; Umaz, Adil; Aydin, Isil; Aydin, Firat
This study reports a sensitive method for trace zinc using slotted quartz tube-flame atomic absorption spectrometry (SQT-FAAS) with citric acid-coated magnetic nanoparticle-solid phase extraction (CAMNP-SPE). To increase the efficiency, we univariately optimized the pH, buffer volume, CAMNP mass, eluent concentration and volume, mixing type and time, temperature, and interaction time. The study identified the limits of detection and quantification values for CAMNP-SPE-SQT-FAAS under the specified optimum conditions to be 12.30 and 41.00 mu g L-1, respectively. The newly developed method improved the detection power of traditional FAAS by 13.25 times. The findings of this study report a sensitive and accurate method to determine trace zinc in complex matrices.
Güneydoğu Anadolu Bölgesindeki Üç Farklı İlin Üzümlerinin GC-FID Metoduyla Yağ Asitlerinin Karşılaştırılması
(2019) Atalar, Mehmet Nuri; Baran, Mehmet Fırat; Umaz, Adil; Gungoren, Muhammed
Bu çalışmada Mardin, Diyarbakır ve Gaziantep kuru üzümlerinin yağ asit düzeyleri belirlendi. Mardin kuru üzümünün yağ asit düzeyleri ΣPUFA % 49.60, ΣMUFA % 29.61, ΣUSFA % 79.21 ve ΣSFA % 22.02 olarak, Diyarbakır kuru üzümünün yağ asit düzeyleri ΣPUFA % 22.80, ΣMUFA % 37.72, ΣUSFA % 60.58, ΣSFA % 40.45 ve Gaziantep kuru üzümünün yağ asit düzeyleri ΣPUFA % 44.77, ΣMUFA % 27.34, ΣUSFA % 72.12, ΣSFA % 28.62 olarak tespit edildi. Mardin ve Gaziantep kuru üzümünün linoleik asit (18:2n6c) düzeyi yüksek çıkarken Diyarbakır kuru üzümünün oleik asit (18:1n9c) ve palmitik asit (16:0) düzeylerinin yüksek çıktığı gözlendi.
Citation - WoS: 11
Citation - Scopus: 11
Synthesis and Characterization of Novel Magnetic Nano-Catalyst (fe₃o_{4< @eddha-Fe) and Their Hydrogen Production Activity}
(Elsevier Sci Ltd, 2024) Umaz, Adil
Due to irreparable crises for nature and people, replacing fossil fuel -based energy with green energy sources is a necessity for nature and humanity. Hydrogen is considered a clean energy transport due to its high energy density, environmental friendliness, high efficiency, and recyclable nature. This study generated hydrogen through NaBH 4 ethanolysis. In hydrogen production studies, there are very few studies with magnetic nano catalysts and very few studies with cheap transition metals. In order to contribute to the literature in this field, in this study, Fe 3 O 4 @SiO 2 @EDDHA-Fe was produced for the first time and used in hydrogen production studies. Fe 3 O 4 @SiO 2 @EDDHA-Fe synthesis was successfully carried out and hydrogen production was successfully implemented. The study also utilized FT-IR, XRD, VSM, BET, and SEM-EDX methods to characterize the structural, physical, and chemical properties of MNCs. The average particle diameter and magnetization value of Fe 3 O 4 @SiO 2 @EDDHA-Fe were 12.81 nm and 30.6 emu/g, respectively. The catalysis experiment designed with 50 mg Fe 3 O 4 @SiO 2 @EDDHA-Fe and 93.75 mM NaBH 4 generated 840 mL H 2 /g NaBH 4 298 K and 947 mL H 2 /g NaBH 4 318 K in 5 -min duration, respectively. At room temperature, the hydrogen generation rate (HGR) and activation energy (Ea) of Fe 3 O 4 @SiO 2 @EDDHA-Fe reaction were calculated as 1040 mL H 2 /gcat & sdot; min and 5.39 kJ/mol, respectively. After the sixth cycle, the reusability test of Fe 3 O 4 @SiO 2 @EDDHA-Fe reaction still retained approximately 87% of the initial hydrogen production volume. The study concluded that Fe 3 O 4 @SiO 2 @EDDHA- Fe is a promising catalyst in hydrogen production from NaBH 4 ethanolysis, as it is affordable and easy to prepare compared to other expensive catalysts.
Citation - WoS: 28
Citation - Scopus: 31
Quantitative determination and removal of pesticide residues in fresh vegetables and fruit products by LC-MS/MS and GC-MS/MS
(SpringerLink, 2023) Elmastas, Ayhan; Umaz, Adil; Pirinc, Vedat; Aydin, Firat
Pesticides are the potent agrochemicals used to successfully manage, repel, or stop pests and weeds in agricultural production. This study analyzed 222 pesticide active substances in 90 samples of seven different vegetables and fruits acquired from producers through liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) and gas chromatography-mass spectrometry/mass spectrometry (GC-MS/MS) technology. The validation parameters of each pesticide's active substances were determined. The LOD, LOQ values, and recovery studies of the 222 active substances were 3.00, 10.00 ng/g, and between 76.07 and 108.08%, respectively. The correlation coefficients and measurement uncertainty were determined to be between 0.990-0.999 and 8.91-31.46%, respectively. There were active substances of chlorpyrifos, acetamiprid, azoxystrobin, difenoconazole, malathion, dieldrin, boscalid, triticonazole, tebuconazole, triadimenol, trifloxystrobin, pirimicarb, and dodine among the vegetable and fruit samples used in the study. There were no active substances in 55 (61%) samples. Among the 35 samples (39%), 31 samples (34%) contained only one active substance, whereas four (5%) contained two active substances. However, the amount of active substances in six (7%) samples was above the maximum residue levels (MRL) limits. Various processes used in the study revealed that peeling was the most effective pesticide residue removal strategy. The washing procedure also proved that it reduced some pesticide residues but failed to eliminate all pesticides. The peeling process successfully reduced a significant amount of the active substances from the products, however, residues remained. Washing the fruits with hot water was also effective in removing residues. As a result, analyses of the peeled sections yielded higher pesticide residue concentrations than those of the entire product.
Evaluation of the Structural, Morphological, Magnetic, Optical, and Dielectric Properties of a Novel Fe3O4@1.4-DHBNanocomposites
(Elsevier Science S.A., 2025) Ece, Muhyettin; Umaz, Adil; Ece, Mehmet Sakir
This study focuses on the detailed analysis of the synthesis, structural, morphological, surface textural, magnetic, optical, and electrical properties of Fe3O4@1,4-DHB magnetic nanocomposites (MNCs). Fe3O4@1,4-DHB MNCs were produced by a one-step chemical reaction process with a core-shell strategy. The average crystallite size, dislocation density, micro-strain, saturation magnetization, surface area and band gap energy values of Fe3O4@1,4-DHB MNCs were measured as 8.14 nm, 15.86 x 10-3 nm-2, 3.74 x 10-3, 41.96 emu/g, 101.96 m2/g and 4.38 eV, respectively. Fe3O4@1,4-DHB MNCs were determined to have an inverse spinel structure, exhibit superparamagnetic, and mesoporous characteristics. The narrow band gap of Fe3O4@1,4-DHB MNCs reveals that it has a wide light usage range and exhibits optical properties. The behaviors of the parameters Bode curve, dielectric constant, dielectric loss factor, loss tangent value, capacitance, admittance (susceptance, conductance), and real electric modulus, loss electric modulus of Fe3O4@1,4-DHB MNCs were investigated. The series resistance of Fe3O4@1,4-DHB MNCs was measured as 402 S2, capacitance as 2.352 x 10-11 F, and charge transfer resistance as 227.3 kS2. It was observed that increasing the frequency decreased the dielectric constant, dielectric loss factor, tans (after a certain value), and capacitance values. However, increasing the applied voltage (at low frequency) increased the phase angle, dielectric loss factor, tans values, capacitance values, and conductance values in a smooth regime. Because this nanocomposite exhibits magnetic, optical and dielectric properties, it can play an important role as a material that can be used in various applications in many branches of industry in the future.